Electric drill.



` ELECTRIC DRILL.

APPLICATION ljlLED Nov.1 e, 190e. l v i Y Patented Dec.. 7,"1-909.

. uventoz P. J. LINCOLN. ELECTRIC DRILL.

. Patented Dec, '7, 1909.

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Patented Dec. 7,-1909.

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like,

lprovision of a ,drill of this character ein-- 'odying novel electrically operated meansl f of which the UNITED STATES rArENr ernten.

rtm1) J, LINcoLN, or BIRMINGHAM, ALABAMA.

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LINCOLN., a

for reciprocating and turning the bit.

The invention further contemplates a 'rock drill which is compact and durablein its construction so as to be readily carried from place to place, and which can be quickly set up in an operative position;

For a full understanding of the invention and the merits thereof and also'to acquire a knowledge of the details-of construction and the means for effectin the result, .reference is to be had to the ollow-ing descriptin and accompanying drawings, in which:

Figure 1 is a side elevation of an electric drill embodying the Invention, Fig. 2` is an enlarged' longitudinal sectional View through l Fig. 7 Ais a diagrammatic view showin the rill, F1 3 1sa transverse sectional View 'on the line 3--3'of`ll`ig` 2, `Fig. 4 is a side elevation-of the armature for turning the drill and the bushing upon which the armature is mounted, Fig. 5 is a sectional view on the line 54,-5 .of Fig. 4, Fig. 6 is a side elevation lof thevdrill rotating deviflzle, t e manner in which the drill is wired, Flg. 8 is a diagrammatic vview showing the tield when the reciprocating armature is at oneI limit of its movement, Fig. 9 is asimi'la 'view showing the field when the reciprocating armature is at the opposite limit of its movement, Fig. 10 is a ldetail view of` one of the bearings within the casing, and, Fig. 11

is a detail view of the coupling for attaching the drill `bit to the drill rod.

Corresponding 'and like -parts are referred.

to in the followgn description and indicated in all the view-'s o the drawings by the same y reference characters. f y

Specifically describing the present einbodi.

ment of the inventiomthenumeral 1 designates the casing within operating mechamsm is mounted, the said casing'having a tubular formation and being constructed of steel or other. suitable mal Bpecication of Letters Patent.

Applicatimi-1ed Nnvember 18,.1808. Serial No. 463,239. v

which the drill Patented Dec. '7, 1909.

f terial adapted to form a path for a magnetic field. This casing may be supported i-n any suitable manner and is shown in the present instance as slidably mounted upon the head 2 of a tripod 3, a screw 4'bei11g provided for moving the casingupon the head t0 feed the drill as required. Arranged within the casing 1 at an intermediate` oint in the length thereof, are the cld coi s c1, c2, c, c, and c which are wound upon'a brass tube 5. A series of collars of wrought iron or similar material which constitute the p' poles of the field magnets, are ltted'upon the'brass tube 5 for holding the eld coils in position, one of .these pole pieces 77? being ,located at one end of the`-ield4coils adjacent the coil el, a second pole piece p2 being lo-4 catedbeuween the coils c2, and c3, a third `pole piece p3 being locatedbetween the coils c3 and c4, while a fourth -pole piece n* is located at the opposite end of the fie d cent the coil c5. d,

Mounted to reciprocate longitudinally within the tube 5.0i' ,the field is an armature 6 which is wound with a coil 7. Fitted around this coil is a bronze sleeve 8 the ends adjaof which are soldered or otherwise rigidly y 'connected to the polesof the armature. A brass drill rod 9 is connected to one end of the armature 6 ,and extends through one end of the casing, the extremity of the rod being designed to have the drill bit securedthereto by any suitable means such `as by the coupler 10. Projecting from the opposite end of the armature and rigidly connected thereto, is a slide operating rod 11 which extends beyond the end of the brass tube 5 of the field and is surrounded by a sleeve 12 of ber or other insulating material. This sleeve is square in cross section yand passes loosely through a hub 13 which is also formed of insulating material and isjournaled within a bearing 14. It 'will thus be obvious that the hub will turn with freely through the same. Strips 15.01? copper orl other conducting material, are se- 7 cured to opposite faces of the square sleeve 12-.1and have theirinner ends connected to the terminals of the armature coil 7. lA pair of contact strips 16 are arranged within 'opposite sides of the opening through. the I hub 13 and bear frictionally againstA thel strips 15 so as to be in electricalconnection therewith. A pair of detachable' end sections 13b1 are secured toI the hub' 13 `by bolts 1.0.0 the rod l1 but Will permit the rod to slide or other suitable means and the inner edges l of these end sections are rahbeted; to rovlde apair of annular grooves withinw ich collecting rings 17 are arranged, one of the of the contact strips 16 while the opposite collecting ring is connected bya wire 19 to the opposite contact strip 16. These two collecting rings are trictionally engaged by brushes 20 carried brush holder 21 which is formed of liber or' other insulating material and is secured to the bearin -14 so as to project laterally therefrom. ith this construction it will be apparent that by connecting the brushes 2O to a'pair of feed wires, an electric current may be caused to pass continuously through the armature coil .the armature is reciprocated hack. and forth and rotated about its axis.

Buffer springs 22 which serve to engage the armature as it, reaches the opposite limits of its movement, are housings 23 secured respectively to the pole piece p* and the pole piece p4@ rlhese springs 'forni cushions for engaging the armature and take up the shocks and jars which would tend to injure the drill and shorten the life thereof. liooscly connected to the extremity of the slide opei'ating rod 11 so that the rod can rotate within the same, is a slide 24 which is loosely mounted u on a guide rod Q5, one end of the guide rod eing shown as threaded inthe bearing 14 while the opposite end is supported by a bracket 26 projecting inwardly from the casing l.

.-As the armature approaches the opposite i holder' 28.

v limits of its movement, this slide is designed oi a `tork 27 upon a brush This brush holder is slidably mounted between a pair of channeled insulating bars 2t) and provided with a transe verse opening within which a pail-'ot brushes or plungers 30 are arranged. These brushes or plungers are in electrical connection with to engage the a rms each other and are normally forced out-- Wardly by means of a spring 3l which is interposed between them. Secured within thc channeled portion of one of the bars Q9, is a long contactI strip 252 while a pair of shortcontact strips 12hand 34 arcsecuicd within the channeled portion ot the opposite bar 29, the short strips being located directly opposite the end portions oi the long strip. When the brush holder has been moved to one limit ot its nio\'eineiit,'tlie pluiigers or brushes 30 produce an electrical connection between the long coi'itact strip 32 andl the short Contact strip -f. while when the brush holder has beenniored toA the opposite limit otits movement .the plungers produce an electrical connection between the long contact strip 3Q; and the short contactstrip 34. AOne end of the tube 5 is closed by a ca 35 while the opposite end. is provided wit a bearing 3G through which thje drill operfitted within rings being connected by a wire 18 to one .so that it'rotates with the rod but mature is designed to revolve ceases .I

ating rod extends. y Surrounding the drill operating rod and journaled within this the rodvto move longitudinally theret rough.

Thev inner end'of the bushing is formed with' an outwardly extending Harige 37 and journaled upon the bushing between this flange and the bearing 36, is a rotary armature T38. for actuating the drill turning said armature beingformed with a series o radially extending oles 38a. A lfield which is disposed about t e armature 38 and cooperates therewith', comprisesA a series of corresponding poles 39 which are carried by a yoke or ring 40 One end of the arma-turev38 upon the ange 37a `ot the bushing. The armature is adapted to pawl and ratchet connection between 'the armature anddrill operating obvious that the drilloperating rod will'rbe turned with `the armat re when the armature is revolved infone direction buty will not be influenced by the armature when it revolves in the opposite direction. ln `the resent instance both the armature and the eld are formed with six poles and the 'arback and forth through an are of 50 degrees. 'j

By reference tothe wiring diagram shownin Fig. 7, itwill be observed that thewindings of the poles't) of the drill turning device are in a shunt circuit from the main line, while the windings of the poles 38 of the armature are Vin series with the coils of the drill reciprocating device. With this coiistructioin itlwill be obvious that when the direction ot the current-flowing through fitted ywithin the casing 1..

is formed with a ratchet 41 whichis engaged by a pawl 42.

l bearing7 is a brass bushing 37 which has agli' device, the

be 'alternately ii-V tated in. opposite directions and with thisv rod a wai be Y' the armature coils is reversed, the polarity nals of the switch to the field windings of.

the drill turning device so that when the l switch is closed thesaid field windings are i2(v t in a shunt circuit. Leading from the. positive terminal of the switch to arhe'ostat 47 which may be of any approved construction and is carried by the cap 35, is a wire 48,

and from this rhcostatl the'current flows.,-

througli a wire 49 to the lield coil c3 ofthe drill reciprocating device, thence'tlirough a l wire 50 to thc armature coil., vof the drill reciprocating device.. With thJ armature at tlieouter limit of its movement so that y56 to the field coil c5 andirom thence to the contact strip 32 from which it is carried to draw the armature toward the opposite tive terminal ofthe switch 45 through the 'FiU' 8, and it will beI o served that t-he field the'coils c3, cf* and c5 so' that the pole piece p1 is the 'northipole By thus inagnetizing man# duce, van electricalfconnection between thcl Contact strips 32 and, the-.current will then dow through-the wires l and-52 to thefield coilc* and thence throughthe wire .53 to the field coil c1., andthence through the Wire '54 tothe amature windings of thei drill turning device. From these armature windings the current passes through a wire through the brushes to the contact strip 33 `which isonnected to the negative terminal ofthe switch by the Wire`55. A diagram of the magnetic field thus` roduced is shotvn in cois c3 ande-c*u and c cperate to produce a single field. of'which the pole piece p2 is the south ole and the pole` piece p* the north pole, 4t e intermediatepole piece p3 being t ead. The field thus produced acts upon the field produced by the armatureand tends limit of its movement. 'In thisxconnection it may be noted that. no current passes' througliythe field coil cf: and that the current `passing through the field coilc1 flows in a reverse directiorr to that passing through these remote pole ieces all danger of the armature field leaking into the outer casing 1 is eliminated.

When the armature has reached the limit of its inneiginovenient, the slide 2t will have en aged the fork 27 and moved the brush 34. The cui-rent now passes from the posirheostat 4 7, throii h the wire 49 and the field coil e3 and tirough the wire 50 and armature coil 7, as in the previous insta-nce. From the armature coil however, the current passes to the Contact strip 34 and through the brushes 30 to the contact stri 32. T hence it fiows through the field coil ff' in a reverse direction to that in which it previously passed through the said coil, and from this coil it flowsthrorghthe wire 56 to the armature windings of the drill rotating device, also passingthrough these Windings in a'reverse direction so as to change the polarity of the armature poles and cause the saine to rotate throughlan are of 50 degrees as previously described. From, these ai'niaturecoils the current flows thziougli the wire 54 to the field coilf'1 9nd thence throughthe wires 53 and 57'torftheffield coil c2 from which it' passes through Vthe Wire 53 to the contact strip and through the wire 55 to the negative pole of the'switch. lIt will be observed that in lthis instance the field coil c* is dead and the curreiitflows through the end coils c1 and c in an opposite direction to that followed in the previous instance and to that shown in Figr, thecoilscl, c2, and c3 cooperate to produce a single field of which the pole piece p3 is the north pole and the pole .piece p1 thesouthf ble, the pole piece p? beinggdeadi' It will also be. observed that the pole piece p* is a south pole, such an arrangementserving as previously mentioned to prevent leakage of the field from the armature. This main field acts upon the field armature to move the a'rinaturc back to its original position. In this nianner the arinature is reciprocated back and forth, the brushes 30'and contact strips 32, 33 and 34 forming a switch device for automatically directingl the current through the variouscoils in the required manner.l

The rheostat Lt7 is operated by means of a turning this handle various aniountsof re- .sistance can be introduced into the circuit so as to cause the drill vto give either `a light or a heavy blow as desired.- In thismanner the drill will bc given the usualv reciprocating movement and also` rotatcd about its axis so as to act effectively upon the stone or other material being drilled.

Having thus described the invention, what is claimed as new is:

1. The combination of a central field coil, a field coil on each side of the central field coil` an end field coil for each of the side field coils, an armature mounted to reciproc'ate within the field coils, a drill operating rod carried by the armature, and means for introducing the central coil and two end Icoils into an electric circuit alternately in series with the respective side coils to actuate the armature.

2. The combination or a central field coil, a field coil on each side of the central coil, an end field coil for each of the, side field coils, poles interposed betweenihe central coil 'and the side coils and also located at the outer ends of the end coils, an armature mounted to reciprocate within the field coils, a drill operating rod carried by the armature, and means for introducing the central coil and two end coils into an electric circuit alternately in sericswith the respective side coils.

3. The combination of a casing, a series of field coils within the casing, an armature mounted to reciprocate within the field coils,

a coilupon the armature',a rod projectin from the armature, an angular sleeve fitte over the rod, conductor strips a plied' to the angular sleeve and insulated rom each other, the said conductor strips being connected to the terminals of the armature coil, a hub journaled within the casing andforined with 'an-angular opening loosely receivingthe before mentioned sleeves, contacts upon the hub for engagin the4 before mentioned conductor strips, colector rings upon the hub in electrical connection with the contacts7 brushes engaging4 the collector rings, and a switch mechanism actuated by the rod for introducing selectedones of' the eld coils alternately into an electric circuit in series with the armature coil.

The-combination of ajcasi'ng, a rod, means for reciprocating the rod,V a rotatably mounted armature carried by the rod and formed. with a plurality of radially projecting poles, a pawl and ratchet connection between the armature andthe rod, a field with poles corresponding to the poles of the armature and adapted to cooperate With the armature to turn the same, and means for periodically reversing the polarity of the poles 4of the armature to cause the same to revolve alternately in opposite directions through a fixed arc. I

5. The combination of a 'series of field coils, an armature mounted to reciprocate Within the tield coils, a drill operating rod' projecting from the armature, feed Wires, a rotary armature carried by the rod and pro- Avided with armature coils, a field coperating with the rotary armature and provided 'A with coils in a shunt circuit With the feed Wires, and means for introducing selected ones of 'the eld-coilsalternately into cir- `cuit with thedfeed Wires in series with the armature coils, y

6. The combination. of a. series of iield coils, an armature .mounted'to reciprocate within the eld 'coils,`,a coil .uponthe reciprocating armature, a drill operating rod projecting from the reciprocatm armature, a rotary armature carrled by t e rod. and having an operative connection therewith, the said rotary armature being provided with coils, feed Wires', a field cooperating-with tlierotaiy armature and provided with coils in a shuntcircuit with the feed Wires, and a switch mechanism actuated by the reciprocating armature for introducing selectedones of the field coils alternately into circuit with the feed Wires in series with the coilsof the reciprocating armature and the I PURD J; LINCOLN. n; 5.] Witnesses y WILLIAM A... PARsoiIs, FRANK. G; WERTz. 

